Polyolefin, adhesive composition containing same, and adhesive tape using said adhesive composition

Patent metadata

Field	Value
Publication number	US-9683141-B2
Application number	US-201314437647-A
Country	US
Kind code	B2
Filing date	Oct 31, 2013
Priority date	Nov 2, 2012
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Provided are an adhesive composition which has high holding strength and leaves no residual glue by using a polyolefinic polymer, and an adhesive tape using the same. A polyolefin which satisfies the following conditions (a-1), (b1), and (b2):(a-1) the relationship between the limiting viscosity and the stereoregularity is represented by the formula (i): −20×η+56≦mmmm≦−20×η+64 (wherein η represents the limiting viscosity measured in tetralin at 135° C., and mmmm represents the meso pentad fraction (mol %)); (b1) the meso pentad fraction (mmmm) is from 20 to 60 mol %; and (b2) the limiting viscosity [η] measured in tetralin at 135° C. is from 0.01 to 2.0 dL/g.

First claim

The invention claimed is:

1. An adhesive composition, comprising:
95 to 5% by mass of a crystalline polyolefin, and
5 to 95% by mass of an amorphous polyolefin;
wherein the crystalline polyolefin satisfies the following conditions (a-1), (b1), and (b2):
(a-1) the relationship between the limiting viscosity and the stereoregularity is represented by formula (i):
−20×η+56≦mmmm≦−20×η+64  formula (i)

wherein η represents the limiting viscosity measured in tetralin at 135° C., and mmmm represents the meso pentad fraction in mol %;
(b1) the meso pentad fraction (mmmm) is from 20 to 60 mol %; and
(b2) the limiting viscosity [η] measured in tetralin at 135° C. is from 0.01 to 2.0 dL/g,
wherein the amorphous polyolefin has a melting point which is lower than 20° C. or is not observed by a differential scanning calorimeter (DSC) and having a ΔH of less than 5 J/g, and
wherein the storage elastic modulus of the adhesive composition at 25° C. obtained from a solid viscoelasticity measurement of the composition is 1 MPa or more and 200 MPa or less, and the storage elastic modulus of the adhesive composition at 50° C. is 1 MPa or more and 100 MPa or less.

2. The adhesive composition according to claim 1 , wherein the crystalline polyolefin has a melting point of 20° C. or higher and 160° C. or lower, and a ΔH of 5 J/g or more and 100 J/g or less.

3. The adhesive composition according to claim 1 , wherein the crystalline polyolefin is a propylene homopolymer.

4. The adhesive composition according to claim 1 , further comprising a tackifier.

5. An adhesive tape, wherein the adhesive composition according to claim 1 is used in an adhesive layer.

6. An adhesive tape, wherein the adhesive composition according to claim 4 is used in an adhesive layer.

7. The adhesive composition according to claim 2 , further comprising a tackifier.

8. The adhesive composition according to claim 3 , further comprising a tackifier.

9. An adhesive tape, wherein the adhesive composition according to claim 7 is used in an adhesive layer.

10. An adhesive tape, wherein the adhesive composition according to claim 8 is used in an adhesive layer.

11. The adhesive composition according to claim 1 , wherein the amorphous polyolefin satisfies the following (a1) to (a5):
(a1) the meso pentad fraction (mmmm) is from 3 to 40 mol %, or the meso diad fraction (m) is from 30 to 95 mol %,
(a2) a sum of a 1,3-bond fraction and a 1,4-bond fraction is less than 0.3 mol %,
(a3) a 2,1-bond fraction is less than 0.3 mol %,
(a4) the molecular weight distribution (Mw/Mn) as measured by gel permeation chromatography (GPC) is 4.0 or less; and
(a5) the weight-average molecular weight (Mw) as measured by GPC is from 5,000 to 1,000,000.

Assignees

• Idemitsu Kosan Co

Inventors

• Minami Yutaka
• Hashima Kazuhiro
• Kanamaru Masami

Classifications

• C08F10/06 Primary

  Propene · CPC title

• C09J7/021

  Chemistry & Metallurgy · mapped topic

• C08L23/12

  Polypropene · CPC title

• C09J123/18

  Homopolymers or copolymers of hydrocarbons having four or more carbon atoms · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title